The shortest distance between the southernmost and northernmost point along the Norwegian coast is the same as the distance from southern Norway to Rome. The total length of the coastline along the mainland including all fjords is about 24,000 km or about half the distance around the equator. When including all islands the total coastline is almost 60.000 km.
A barrier of small and large islands protects the coast and fjord areas against wind and waves from the open ocean. Deep large fjords cut in from the coastline and typically have a sill nearby the ocean and a deep pool inside of the sill. The longest fjord in Norway is Sognefjorden and is about 200 km long and maximum depth of about 1300 m. The deepest fjords elsewhere in Norway are about 700 m deep, while the majority of the fjords is 300-500 m deep. Some of the major fjords in Troms and Finnmark does not have sills (such as Porsangerfjord) and can therefore regarded more as bays.